diff --git a/lib/params/def.ex b/lib/params/def.ex
index 230d238..fcb4ba7 100644
--- a/lib/params/def.ex
+++ b/lib/params/def.ex
@@ -126,6 +126,8 @@ defmodule Params.Def do
   defp field_call(meta) do
     cond do
       Keyword.get(meta, :field) -> :field
+      Keyword.get(meta, :embeds_one) -> :embeds_one
+      Keyword.get(meta, :embeds_many) -> :embeds_many
       Keyword.get(meta, :embeds) ->
         "embeds_#{Keyword.get(meta, :cardinality, :one)}" |> String.to_atom
     end
@@ -137,11 +139,13 @@ defmodule Params.Def do
     cond do
       Keyword.get(meta, :field) -> Keyword.get(meta, :field)
       Keyword.get(meta, :embeds) -> module_concat(module, name)
+      Keyword.get(meta, :embeds_one) -> Keyword.get(meta, :embeds_one)
+      Keyword.get(meta, :embeds_many) -> Keyword.get(meta, :embeds_many)
     end
   end
 
   defp field_options(meta) do
-    Keyword.drop(meta, [:module, :name, :field, :embeds, :required, :cardinality])
+    Keyword.drop(meta, [:module, :name, :field, :embeds, :embeds_one, :embeds_many, :required, :cardinality])
   end
 
   def normalize_schema(dict, module) do
@@ -156,6 +160,14 @@ defmodule Params.Def do
     normalize_field(v, [name: name, required: required, module: module])
   end
 
+  defp normalize_field({:embeds_one, embed_module}, options) do
+    [embeds_one: embed_module] ++ options
+  end
+
+  defp normalize_field({:embeds_many, embed_module}, options) do
+    [embeds_many: embed_module] ++ options
+  end
+
   defp normalize_field(schema = %{}, options) do
     module = module_concat Keyword.get(options, :module), Keyword.get(options, :name)
     [embeds: normalize_schema(schema, module)] ++ options
diff --git a/test/params_test.exs b/test/params_test.exs
index 0a95f7d..5c22be0 100644
--- a/test/params_test.exs
+++ b/test/params_test.exs
@@ -136,6 +136,76 @@ defmodule ParamsTest do
     assert %Changeset{valid?: true} = kitten(params)
   end
 
+  defparams puppy %{
+    breed!:  :string,
+    age_min: :integer,
+    age_max: :integer,
+    near_location!: {:embeds_one, LocationParams}
+  }
+
+  test "puppy module has list of required fields" do
+    assert [:near_location, :breed] = Params.required(Params.ParamsTest.Puppy)
+  end
+
+  test "puppy module has list of optional fields" do
+    assert [:age_min, :age_max] = Params.optional(Params.ParamsTest.Puppy)
+  end
+
+  test "puppy method returns changeset" do
+    assert %Changeset{} = puppy(%{})
+  end
+
+  test "puppy returns valid changeset when all data is ok" do
+    params = %{
+      "breed" => "Russian Blue",
+      "age_min" => "0",
+      "age_max" => "4",
+      "near_location" => %{
+        "latitude" => "87.5",
+        "longitude" => "-90.0"
+      }
+    }
+    assert %Changeset{valid?: true} = puppy(params)
+  end
+
+  defparams dragon %{
+    breed!:  :string,
+    age_min: :integer,
+    age_max: :integer,
+    near_locations!: {:embeds_many, LocationParams}
+  }
+
+  test "dragon module has list of required fields" do
+    assert [:near_locations, :breed] = Params.required(Params.ParamsTest.Dragon)
+  end
+
+  test "dragon module has list of optional fields" do
+    assert [:age_min, :age_max] = Params.optional(Params.ParamsTest.Dragon)
+  end
+
+  test "dragon method returns changeset" do
+    assert %Changeset{} = dragon(%{})
+  end
+
+  test "dragon returns valid changeset when all data is ok" do
+    params = %{
+      "breed" => "Russian Blue",
+      "age_min" => "0",
+      "age_max" => "4",
+      "near_locations" => [
+        %{
+          "latitude" => "87.5",
+          "longitude" => "-90.0"
+        },
+        %{
+          "latitude" => "67.5",
+          "longitude" => "-60.0"
+        }
+      ]
+    }
+    assert %Changeset{valid?: true} = dragon(params)
+  end
+
   defparams kid(
       %{
         name: :string,